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在MATLAB/Simulink环境下分别搭建了由双馈异步风电机组、普通异步风电机组和直驱永磁同步风电机组组成的单机无穷大系统,仿真得到了相同容量的3种风电机组在不同故障下的短路电流,分析了其短路特性及对所接入电网电流保护的影响。仿真结果表明,当外部短路故障相同时,普通异步风电机组短路电流对接入网冲击较大但衰减很快,双馈异步风电机组是否提供持续短路电流与其保护动作特性密切相关,直驱永磁同步风电机组可以提供持续的短路电流。针对不同风电机组的短路特性,提出了相应的保护配置方案及原则。
In the environment of MATLAB / Simulink, a single machine infinite system consisting of doubly fed asynchronous wind turbine, common asynchronous wind turbine and direct-driven permanent magnet synchronous wind turbine is built respectively. The short circuit of three wind turbines of the same capacity under different faults is simulated Current, analyzed its short circuit characteristics and the impact on the current protection of the access grid. The simulation results show that the short-circuit current of common asynchronous wind turbine has a greater impact on the access network but the attenuation is very fast when the external short-circuit fault is the same. Whether the continuous short-circuit current is provided by doubly fed asynchronous wind turbine is closely related to its protective action characteristics. Synchronous wind turbines can provide continuous short-circuit current. According to the short-circuit characteristics of different wind turbines, the corresponding protection configuration schemes and principles are proposed.